package utils.bobo.com.boboutils.App;

import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.app.TaskStackBuilder;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import utils.bobo.com.boboutils.R;

public class DynamicViewPageActivity extends FragmentActivity {

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide fragments representing
     * each object in a collection. We use a {@link android.support.v4.app.FragmentStatePagerAdapter}
     * derivative, which will destroy and re-create fragments as needed, saving and restoring their
     * state in the process. This is important to conserve memory and is a best practice when
     * allowing navigation between objects in a potentially large collection.
     */
    DemoCollectionPagerAdapter mDemoCollectionPagerAdapter;

    /**
     * The {@link android.support.v4.view.ViewPager} that will display the object collection.
     */
    ViewPager mViewPager;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dynamic_view_page);

        // Create an adapter that when requested, will return a fragment representing an object in
        // the collection.
        //
        // ViewPager and its adapters use support library fragments, so we must use
        // getSupportFragmentManager.
        mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(getSupportFragmentManager());

        // Set up action bar.
        final ActionBar actionBar = getActionBar();

        // Specify that the Home button should show an "Up" caret, indicating that touching the
        // button will take the user one step up in the application's hierarchy.
        actionBar.setDisplayHomeAsUpEnabled(true);

        // Set up the ViewPager, attaching the adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mDemoCollectionPagerAdapter);
        Button delButton = (Button) this.findViewById(R.id.delButton);
        delButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int index = mViewPager.getCurrentItem();
                mDemoCollectionPagerAdapter.removeItem(index);
                mDemoCollectionPagerAdapter.notifyDataSetChanged();
                //mViewPager.setCurrentItem(0);
            }
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                finish();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A {@link android.support.v4.app.FragmentStatePagerAdapter} that returns a fragment
     * representing an object in the collection.
     */
    public static class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter {
        private List<Fragment> mFragments;
        public DemoCollectionPagerAdapter(FragmentManager fm) {
            super(fm);
            mFragments = new ArrayList<>();
            for(int i=0; i<3;i++){
                Fragment fragment = new DemoObjectFragment();
                Bundle args = new Bundle();
                args.putInt(DemoObjectFragment.ARG_OBJECT, i + 1); // Our object is just an integer :-P
                fragment.setArguments(args);
                mFragments.add(fragment);
            }
        }
        public void removeItem(int index){
            if(index >= 0 && index < mFragments.size()) {
                mFragments.remove(index);
            }
        }
        @Override
        public Fragment getItem(int i) {
            return mFragments.get(i);
        }

        @Override
        public int getCount() {
            return mFragments.size();
        }
        @Override
        public int getItemPosition(Object object) {
            return PagerAdapter.POSITION_NONE;
        }
        @Override
        public CharSequence getPageTitle(int position) {
            return "OBJECT " + (position + 1);
        }
    }

    /**
     * A dummy fragment representing a section of the app, but that simply displays dummy text.
     */
    public static class DemoObjectFragment extends Fragment {

        public static final String ARG_OBJECT = "object";

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_collection_object, container, false);
            Bundle args = getArguments();
            ((TextView) rootView.findViewById(android.R.id.text1)).setText(
                    Integer.toString(args.getInt(ARG_OBJECT)));
            return rootView;
        }
    }

}
